Enameling oven



Oct. 23, 1928. 1,688,710

c. L. HEISLER ENAMELING OVEN Filed Dec. 29, 1926 2 Sheets-Sheet l Charles L.Heislen His Attorney.

Oct. 23, 1928.

C. L. HEISLER ENAMELING OVEN Filed Dec. 29, 1926 2 Sheets-Sheet Inventor: CharlesLHeisler,

H i s Attorn ey.

Patented oct. 23, 1928. I 1,688,710 UNITED STATES PATENT OFFICE.

CHARLES L. HEISLER, F SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELEC- TRIO COMPANY, A CORPORATION OF NEW YORK.

ENAMELING OVEN.

Application filed December 29, 1926. Serial No. 157,800.

My invention relates to enameling ovens, 14 and 15 and a horizontal wall '16 and a more particularly to ovens for enameling verticalwall 17. Finally, the hot gases pass wire, and has for its object the provision of a beneath the lower end of the wall 17 and into simple and reliable oven wherein the wires a suitable Smokestack 18. Outer casings 19 may be readily placed in the oven. and 20 are provided, the casing 19 being 60 More particularly, my invention r lates to. spaced from: the wall 16 and the space thus ovens for enameling Wire, for example, elecformed filled with a suitable heatinsulating trical conductors, of the type in which the material 21, and the casing 20 being suitably wire passes around drums at opposite ends spaced from the bottom of the oven to proof the oven and is thereby fed back and vide space for heat insulating material 22. 05 forth through the oven a number of times, a It will be observed that I have shown the coating of enamel being ordinarily applied invention as comprising double ovens 23 and before each pass through the oven. In one 2 1, Fig. 2, the smoke stack 18 being placed of its aspects, my invention has for'its object between the two ovens. Since" the two ovens the provision of an oven in which the wire are substantially duplicates, only one oven, 70 maybe readily put in place without the i. e., oven 24, will be described in'detail, it benecessity of threading it through the oven. ingunderstood that the oven 23 is identical or In carrying out my invention, I provide a equivalent in construction. At the opposite slot in the side of the oven and extending ends of the oven 24 are two drums 25 and 26,

the full length thereof through which the respectively, the upper surfaces of the drums 7 wires may be passed sidewise intothe heating being on a level slightly below the top of chamber. the heating chamber 10 so that wires passin For a more. complete understanding of over the drums from one to the other will my invention, reference should be had to the travel through the heating chamber near accompanying drawing in which Fig. l is the top thereof, the wires returning from one a side elevation view partly in section of an drum to the other at the bottom of the oven on enameling oven embodying my invention; the exterior thereof before entering the oven Fig. 2 is a plan view of the oven shown in for each travel therethrough. Before entering Fig. 1; Fig. 3 is an end elevation view partly the oven, the wire passes through a suitable 30 in section of the device shown in Figs. 1 and container 27 in which is a bath of the enamel, v2, while Fi 4 is a sectional view showing whereby the wire is given a fresh coat of a modified Ormenamel which is baked upon its subsequent Referring to the drawing, my invention in travel through the heating chamber. By one form comprises anelongated oven heatproviding for a plurality of passes of the 35 ing chamber 10 which is defined by top, botwire through the even, a plurality of conton and left hand side walls made of a suitsecutive coatings of enamel are applied. As able heat conducting material, such as cast shown, the wire asses through the oven iron. Asshown, these walls are formed by eight times whereby eight coats of enamel a U shaped cast iron member 11 which is are applied.

40 placed on its side with its opening toward e The oven is open at each end to provide the right hand side of the furnace, as viewed for the entrance and exit of the wires. As in Fig. 3. Cooperating with the exterior of shown in Fig. 3, a horizontal slot 28 is prothe member 11 issuitable heating means, vided for the wires, at each end near the such as a gas heater 12 provided with a plutop of the heating chamber. This slot, as

rality of nozzles 13 spaced along the length shown in Fig. 1, is provided in a metal plate of the member 11. As shown in Fig. 3, the 29 secured against the end of the heating gas heater is directed against the bottom of chamber, or to be exact, against the end of the member 11, and the hot gases are caused the member 11. It will be understood that to pass around the left hand side and top, a plate 29 with a slot is provided for the left 50 as indicated by the arrows, by means of suithand end of the even, as well. as for the able baflie' walls 14 and 15. ,After thus passri ht hand end, as shown in Fig. 1. ing in contact with the member 11, the hot %I). order to provide for insertion of the gases are directed upward and in a reverse wires, a slot 30 is provided at the outer side direction, and then downward through a of'the heating chamber and at the bottom flue formed respectively between the walls thereof. As shown in Fig. 3, a plate 31 is passing it sidewise through secured against the upper right hand side of p the member 11 and extends downward, terminatin in spaced relation with the lower side of the member 11 so as to leave the slot 30. The casing 19 extends around the side of the, oven and 'oins the plate 31 at its lower edge to provide a space for the heat insulating material 21, whereb a heat insulating side wall is provided, 's shown in Fig. 3, the end plates 29 are each provided with an inclined slot 32 which communicates at its lower end with the side slot 30 and at its upper end with the horizontal slot 28. By means of this arrangement, it will be observed that each len th of wire passing through the oven can e inserted by simply the slot 30, then upward through the slots 32 at each end into the horizontalslot 28 where it can be moved to the desired position corresponding with the position it occupies on the drums 25 and 26. By means of this arrangement, the wires can be inserted very quickly and easily, as com ared with the usual method of threading t hemthrough the heatin chamber from one end to the other. Furthermore, by providing the slot 30 near the bottom of the heating chamber, but little loss of heat takes )lace through the slot. 1

In the mo ified form of my invention shown in Fig. 4:, I have provided an electric resistor 33 for heating the oven. As shown, this resistor is mounted directly below the member 11 and consists of a length of resist ance heating material which is passed aroun spools 34 and 35 supported at opposite sides of the member 11.

In order to promote rapid initial heating of the furnace, I provided a plurality of apertures 36 (Figs. 3 and 4) in the bottom wall of the heating chamber, i. e., in the member 11. 'A plate 37 is slidably mounted ably movable. over the a in guides on the member 11 so as to be slidertures 36 to close them under normal con itions of operation. When the furnace is being preheated upon starting, however, this plate is moved to bring apertures 38 in the plate in coincidence with the apertures -36, whereby the heated gases pass from the source of heat directly into the heating chamber 10. The chamber which the a ertures 36 wi l short time, after he closed by the plate 37 an the temperature maintained by heat conducted through the member 11.

can thus be heated in a ver While I have described my invention as embodied in concrete form and as operating in a. specific manner, in accordance with the I 7 provisions of the patent statutes, it should be undcrstod that I do not limit my invention thereto, since various modifications thereof will suggest the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. An oven'for enameling wire comprising walls forming a heating chamber, one of said walls being provided with a relatively narrow opening through which the Wire may be' passed sidewise into said chamber, and heating means for said chamber.

2. An oven for enameling wire comprising walls form'ng a heating chamber, one of said walls beingprevided with a relatively narrow opening near the bottom of said chamber extending lengthwise thereof through themselves to those skilled in which the wire to be enameled may be passed sidewise into said chamber, and heating means for said chamber.

3. An oven for enamellng wlre' comprlsin -walls forming a heating chamber provide (1 means.

, 4. An oven for enameling wire comprising walls forming a heating chember provided with an opening at each end, a drum mounted at each end of said chamber adjacent said openings, one of the side walls of said heating chamber being provided with an elongated opening through which the wire to be enameled may be passed sidewise into said chamber and mounted on said drums, and heating means for said chamber.

5. An enameling oven comprising heat conducting walls forming a fuel fired heating chamber, heating means on the outside of said walls, said walls being provided with apertures through which hot gases are ad: mitted directly from said heating means into said chamber for preheating, and means comprising a slidable perforated plate for closing said apertures to shut off said gases after said chamber has been heated.

In witness whereof, I have hereunto set my hand this 24th day of December, 1926.

CHARLES L. HEISEER.

to said feeding and drawing 

